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A234238
as a simple table
n
a(n)
1
24
2
54
3
121
4
304
5
780
6
2352
7
127744
8
430272
9
33501184
10
184773312
11
8589082624
[24,54,121,304,780,2352,127744,430272,33501184, 184773312,8589082624]